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Business Combination (Additional Information) (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 01, 2016
USD ($)
office
shares
Feb. 29, 2016
USD ($)
$ / shares
Mar. 31, 2016
USD ($)
office
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]          
Number of offices | office     52    
Assets     $ 2,866,727   $ 2,373,701
Equity     321,638   252,348
Goodwill     53,671   $ 20,536
Net income included in pro forma financial information     8,615 $ 9,153  
Revenue included in pro forma financial information     31,535 $ 31,806  
River Valley Bancorp          
Business Acquisition [Line Items]          
Assets   $ 516,300      
Equity   $ 56,600      
Direct acquisition costs $ 3,884        
Goodwill 33,135        
Intangible assets $ 2,613        
Shares of common stock issued for acquisition (in shares) | shares 1,942,000        
Number of the Company's common stock for each share of RIVR converted | shares 0.770        
Cash portion, cash per share for RIVR common stock converted (in USD per share) | $ / shares   $ 9.90      
Cash consideration to shareholders $ 24,975 $ 24,975      
Amount paid to persons who held options to purchase River Valley common stock 395 $ 395      
Acquired receivables, fair value 309,100        
Acquired receivables, gross contractual amount $ 405,100        
Net income included in pro forma financial information     1,276    
Revenue included in pro forma financial information     $ 4,695    
Southeast Indiana | River Valley Bancorp          
Business Acquisition [Line Items]          
Number of offices | office 14        
Northern Kentucky | River Valley Bancorp          
Business Acquisition [Line Items]          
Number of offices | office 1        
Core deposits | River Valley Bancorp          
Business Acquisition [Line Items]          
Weighted average useful life     8 years